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ナズココーン

Nazko

火砕丘 · Canada · 1238m

Nazko cone is the easternmost and youngest volcano of the Anahim volcanic belt in the Chilcotin-Nechako Plateau in central British Columbia. The 120-m-high cone is seen here across a valley from the SW. The central subglacial mound is partly enveloped by younger, coalescing cones that form the summit ridge. A 7,200-year-old lava flow forms the forested margin of the swamp in the middle foreground.
Nazko cone is the easternmost and youngest volcano of the Anahim volcanic belt in the Chilcotin-Nechako Plateau in central British Columbia. The 120-m-high cone is seen here across a valley from the SW. The central subglacial mound is partly enveloped by younger, coalescing cones that form the summit ridge. A 7,200-year-old lava flow forms the forested margin of the swamp in the middle foreground. · 写真: Photo by Geological Survey of Canada (courtesy of Cathie Hickson). · Wikimedia Commons
タイプ
火砕丘
国
Canada
地域
North America Volcanic Regions / Interior Western Canada Volcanic Province
標高
1238m
座標
52.928, -123.732
最終噴火
-5220年
テクトニクス環境
Intraplate / Continental crust (> 25 km)
火山地形
Minor (Basaltic)
主要岩石
Trachybasalt / Tephrite Basanite
地質学的概要

Nazko Cone, the easternmost and youngest volcano of the Anahim Volcanic Belt in the Chilcotin-Nechako Plateau, central British Columbia, rests on glacial till. It was formed in three episodes of activity, the first of which took place during a Pleistocene interglacial stage about 340,000 years ago (Souther et al., 1987). The second stage produced a large hyaloclastite scoria mound erupted beneath the Cordilleran ice sheet during the late Pleistocene. The final activity occurred about 7,200 years ago, forming a compound subaerial basanitic cinder cone that overtopped the hyaloclastite mound and produced two small lava flows that traveled about 1 km W. An airfall tephra deposit extends several kilometers to the N and E. Mining of the red cinder and scoria deposits began in the early 1990s.

Wikipedia の要約

英語版の要約

Nazko Cone is a small potentially active basaltic cinder cone in central British Columbia, Canada, located 75 km west of Quesnel and 150 kilometers southwest of Prince George. It is considered the easternmost volcano in the Anahim Volcanic Belt. The small tree-covered cone rises 120 m above the Chilcotin-Nechako Plateau and rests on glacial till. It was formed in three episodes of activity, the first of which took place during the Pleistocene interglacial stage about 340,000 years ago. The second stage produced a large hyaloclastite scoria mound erupted beneath the Cordilleran Ice Sheet during the Pleistocene. Its last eruption produced two small lava flows that traveled 1 km to the west, along with a blanket of volcanic ash that extends several km to the north and east of the cone.

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噴火履歴

概要 (VEI時系列)
バーをクリックすると個別の噴火が表示されます
5220 BCE~5220 BCE · 1件 · 最大 VEI ?5220 BCE5220 BCE5219 BCE5219 BCE5219 BCE

詳細タイムライン

  1. 紀元前 5220年 (±100年)VEI ?地質学的推定
    BCE 5220 ~ 進行中

外部リンク

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